Sex / orgasm

So my boyfriend and I never really had a problem with our sex life till after our son was born. Now since my son I feel like I don’t have a orgasm as much before I would orgasm EVERY TIME me and him has sex now I don’t and it’s very discouraging and annoying so I get aggravated sometimes. And my boyfriend loveeeeee sex it’s one of his love language and he don’t mind putting in the extra work but I was wondering is this normal? And what’s some tips I can do to orgasm ?👀